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Beadle
These living indicators give us a “heads-up” on changes in the stream’s environment that could affect larger animals and even humans—so it’s important to pay attention to them!

Maya
And stonefly larvae are sensitive to pollution?

Beadle
Yes. “EPT” is an abbreviation for Ephemeroptera, Plecoptera, and Trichoptera, insect groups affected by many kinds of pollution. The common names for EPTs are mayflies, stoneflies, and caddisflies. A greater number of different types of EPTs usually indicates better water quality.

Viola
Now that even Ms. Crowbes understands, take a look at this! This data was collected from four sampling locations along Obsidian Creek! There are very few EPT species in Site 3—and almost none in Site 4!



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Cast of characters - Maya Crowbes, Dr. A Beadle, Gray Fischer, Viola DeRama
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Q: Why should you pay attention to changes in the type of bugs found in a stream?

GLOSSARY: EPT—abbreviation for Ephemeroptera, Plecoptera, and Trichoptera, insect groups affected by many kinds of water pollution

Ephemeroptera—scientific name of mayflies

Plecoptra—the scientific name for stoneflies

Tricoptera—the scientific name for caddisflies